This is the 15698th most frequent Polish word.
szampanem
"Szampanem" is the instrumental form of "szampan," meaning "champagne" in English.
The word 'szampanem' is instrumental case of 'szampan', used here to indicate the tool or means by which the action (toasting) is performed.
Wznosimy toast szampanem za zdrowie nowożeńców.
We toast with champagne to the health of the newlyweds.
The word 'szampanem' seems used incorrectly here, as typically it would not align with this context; I suspect the intended word was 'szampana' (accusative case of 'szampan').
Kup szampanem na jutrzejszą uroczystość.
Buy champagne for tomorrow's celebration.
In this sentence, 'szampanem' is once again in the instrumental case, highlighting what is being enjoyed or consumed.